Cheking all chekboxes in gridview by cheking header chekbox

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C#

ASP

.NET

<script type="text/javascript">
     function chkAllCheckbox(obj) {
         var gv = document.getElementById('<%=gvSchoolDisrict.ClientID %>');
         for (var i = 0; i < gv.all.length; i++) {
             var node = gv.all[i];
             node.checked = obj.checked;
         }
     }
</script>

I am using this code to check all the checkboxes but I want do it with out using server tag in script. Can any one please help me in this regard!